智能数据流包丢弃技术 Intelligent Flow Packet Discard
如果其目的地址不在这个路由表里，路由器就将数据包丢弃。
If the destination address is not in the routing table, the packet is dropped.
上面的输出说明，内核并没有丢弃任何数据包，这是很好的情况。
The output shows that the kernel dropped no packets, which is a good thing.
例如，- d选项将显示您的通信子系统所接收的、传输的和丢弃的数据包的总数。
For example, the -d option shows the overall number of packets received, transmitted, and dropped in your communication subsystem.
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